Dairy farm workers lodged 200 complaints against their employers from August 2012 to December last year.
Figures obtained under the Official Information Act from the Ministry of Business Innovation and Employment show that most grievances related to the Holidays Act (63 complaints) and the Minimum Wage Act (21 complaints). Fourteen migrant workers made complaints.
Labour inspectorate general manager George Mason says each complaint can involve more than one problem.
One complaint could involve non-payment of the minimum wage and non-payment of annual holidays.
Nationally, from 2009 to last year, it received 729 complaints that covered 1328 problems. The Holidays Act recorded 879 complaints ahead of 237 minimum wage act complaints. Breaches were found and arrears due for 34 complaints about the Holidays Act and seven for the Minimum Wage Act.